Acoustic logging azimuth receiving assembly and acoustic logging tool

Abstract

This invention provides an acoustic logging azimuth receiver assembly and an acoustic logging instrument, belonging to the technical field of logging devices. It includes: a mandrel with multiple transverse sound-insulating grooves spaced along its length; multiple receiving transducer assemblies spaced along the mandrel's length; each receiving transducer assembly includes: a base fitted onto the mandrel; at least one receiving transducer mounted on the base via a mounting mechanism; and a locking mechanism mounted on the base for fixing the mounting mechanism to the base. This invention features a simple structure, small size, applicability to various logging instruments, wide applicability, high receiving sensitivity, and compatibility with both azimuth receiving transducers and conventional receiving transducers.

Description

Technical Field

[0001] This invention relates to the field of logging equipment technology, specifically to an acoustic logging azimuth receiving assembly and an acoustic logging instrument. Background Technology

[0002] In recent years, with the rapid growth of global energy demand and the decreasing reserves of conventional oil and gas, unconventional and medium-deep oil and gas reservoirs have become the focus of exploration and development. Horizontal wells and highly deviated wells have become the main well types, and the demand for exploration and development of complex oil and gas reservoirs with anisotropic formations and heterogeneity is increasing, giving rise to a strong demand for new logging methods and technologies with azimuth resolution capabilities. Acoustic logging, as one of the most widely used logging technologies, has important applications in all stages of oilfield exploration and development. Developing azimuth-resolution acoustic logging technology to obtain acoustic logging data in the three-dimensional wellbore space plays a crucial role in the development of unconventional and complex oil and gas reservoirs. The acoustic transducer is the core detector of acoustic logging equipment, and its performance directly affects the key performance parameters of acoustic logging equipment, such as detection capability, resolution, detection depth, and temperature performance. Developing acoustic transducers and acoustic logging instruments with azimuth resolution capabilities can effectively improve the azimuth resolution of acoustic logging and is a key link in the development of azimuth-resolution acoustic logging technology.

[0003] Azimuth acoustic transducers include azimuth transmitting transducers and azimuth receiving transducers. Azimuth transmitting transducers often use phased array technology, achieving directional sound beam transmission through delayed transmission of multiple transmitting units. Azimuth receiving transducers are typically implemented using multiple independently operating receiving transducer panels. The receiving sensitivity and bandwidth of a single transducer panel determine the performance of the azimuth receiving transducer. These transducer panels usually adopt a cuboid sheet structure, achieving the conversion of acoustic and electrical signals through vibration in the thickness direction. The material and dimensions of the cuboid are the main parameters determining the receiving sensitivity of a single transducer panel.

[0004] Therefore, to improve the receiving sensitivity of azimuth transducers, it is necessary to achieve small-sized, high-sensitivity transducers. Chinese patent CN201110030597 proposes a cylindrical ring-shaped piezoelectric ceramic electroacoustic transducer, whose receiving sensitivity exceeds that of existing cuboid sheet-shaped transducers. When using this small-diameter tubular transducer for azimuth reception, the tubular transducers need to be evenly distributed at different circumferential angles to form a transducer assembly. This transducer assembly is then arranged at different source distances along the axial direction to collect signals from different source distances and different azimuth directions. Azimuth array reception brings more information but also introduces a large data volume. Depending on the specific application requirements, it is not necessary for each receiver to perform azimuth reception; therefore, compatibility between azimuth reception and conventional transducers needs to be achieved on a single instrument. Summary of the Invention

[0005] The purpose of this invention is to provide an acoustic logging azimuth receiver assembly and an acoustic logging instrument, so as to at least solve the problems of low receiving sensitivity, small applicability, and inability to achieve compatibility between the existing azimuth receiver transducer and conventional transducers.

[0006] To achieve the above objectives, a first aspect of the present invention provides an acoustic logging azimuth receiving assembly, the acoustic logging azimuth receiving assembly comprising:

[0007] The mandrel has multiple transverse sound insulation grooves spaced apart along its length.

[0008] Multiple receiving transducer assemblies are spaced apart on the mandrel along its length, and each receiving transducer assembly includes:

[0009] The base is fitted onto the mandrel;

[0010] At least one receiving transducer is mounted on the base via a mounting mechanism;

[0011] A locking mechanism is provided on the base for fixing the mounting mechanism to the base.

[0012] Optionally, the spindle is hollow inside, and multiple wiring holes and multiple mounting holes are spaced apart along the length of the spindle. The wiring holes are used to introduce the wires of the corresponding receiving transducer assembly into the spindle. Each mounting hole is equipped with a corresponding mounting screw.

[0013] Each base is provided with positioning holes, and the base passes through the corresponding positioning holes and the matching installation.

[0014] The hole and mounting screws are fixedly fitted onto the mandrel.

[0015] Optionally, the mounting mechanism includes:

[0016] At least two mounting sleeves are provided, with one mounting sleeve at each of the two ends of each receiving transducer;

[0017] Two symmetrically arranged clamping plates are provided, each with a limiting mounting groove extending through its middle. The two clamping plates pass through the ends of the base via the corresponding limiting mounting grooves, thereby being mounted on the base. Each of the two clamping plates has at least one mounting groove on its opposite surface, which is used to accommodate a corresponding mounting sleeve to fix the receiving transducer between the two clamping plates.

[0018] Optionally, each mounting groove and each mounting sleeve is provided with a through hole, and the wire receiving the transducer passes through the through hole of the corresponding mounting groove and the through hole of the mounting sleeve in sequence, and enters the spindle through the wiring hole.

[0019] Optionally, multiple transducer clearance slots are provided at radial intervals along the base, and each transducer clearance slot has a mounting sleeve clearance slot at both ends.

[0020] The transducer clearance slot is used to accommodate the receiving transducer;

[0021] The mounting sleeve recess engages with the corresponding receiving mounting sleeve.

[0022] Optionally, the outer surface of the base is provided with two limiting step surfaces at intervals, and the clamping plate is located on the corresponding limiting step surface.

[0023] Optionally, at least one limiting groove is provided on the limiting step surface;

[0024] The clamping plate is provided with at least one limiting protrusion that matches the limiting groove. The limiting groove and the limiting protrusion match each other. When the clamping plate is installed on the base, the engagement of the limiting groove and the corresponding limiting protrusion can prevent the clamping plate from rotating relative to the base.

[0025] Optionally, the outer surface of the base is provided with two positioning surfaces at intervals. The positioning surfaces match the limiting installation grooves. When the clamp is installed on the base, the positioning surfaces engage with the corresponding limiting installation grooves, which can prevent the clamp from rotating relative to the base.

[0026] The limiting mounting groove is a non-circular groove.

[0027] Optionally, the outer surface of the base is provided with external threads at intervals;

[0028] The locking mechanism includes:

[0029] Two lock nuts are used to secure the corresponding mounting mechanism to the base via a threaded connection.

[0030] Optionally, each locking nut is provided with at least one threaded hole;

[0031] The locking mechanism further includes:

[0032] At least two lock screws are provided, one lock screw in each screw hole, to prevent the lock nut from loosening by tightening the lock screws after the lock nut has been tightened.

[0033] On the other hand, the present invention also provides an acoustic logging tool, the acoustic logging tool comprising:

[0034] An acoustic section and at least one circuit section, the circuit section being disposed at the end of the acoustic section;

[0035] The acoustic short sections include:

[0036] The instrument casing has internal storage space;

[0037] The aforementioned acoustic logging azimuth receiver assembly is housed within the internal accommodating space of the instrument housing;

[0038] The transmitting transducer is disposed within the internal housing of the instrument.

[0039] Multiple sound insulation elements are provided on the instrument housing and spindle between the transmitting transducer and the acoustic logging azimuth receiving assembly, as well as between two adjacent receiving transducer assemblies of the acoustic logging azimuth receiving assembly. The sound insulation elements are used to attenuate and delay the sound waves propagating on the housing and spindle.

[0040] Optionally, an acoustic window is provided on the instrument housing opposite to the transmitting and receiving transducers to allow sound waves to penetrate the instrument housing.

[0041] Optionally, the internal space of the instrument housing is filled with oil to balance the well pressure during the logging process, and the transmitting transducer and the acoustic logging azimuth receiver assembly are both sealed in the oil.

[0042] This solution integrates multiple receiving transducers into a single receiving transducer assembly via an installation mechanism, a locking mechanism, and a base. Multiple receiving transducer assemblies are also mounted on a spindle to form an acoustic logging azimuth receiving assembly. This assembly is simple in structure, small in size, and can be used with different logging instruments. It has a wide range of applications, high receiving sensitivity, and is compatible with both azimuth receiving transducers and conventional receiving transducers.

[0043] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0044] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0045] Figure 1 This is a schematic diagram of the acoustic logging azimuth receiver assembly provided by the present invention;

[0046] Figure 2 This is a schematic diagram of the mandrel provided by the present invention;

[0047] Figure 3 This is a schematic diagram of the receiving transducer assembly provided by the present invention;

[0048] Figure 4 This is a cross-sectional schematic diagram of the receiving transducer assembly provided by the present invention;

[0049] Figure 5 This is a side view of the base provided by the present invention;

[0050] Figure 6 This is a cross-sectional schematic diagram of the base in the first embodiment provided by the present invention;

[0051] Figure 7 This is a partially enlarged schematic diagram of the base in the second embodiment provided by the present invention;

[0052] Figure 8 This is a front view of the clamping plate in the first embodiment provided by the present invention;

[0053] Figure 9 This is a side view of the clamping plate in the first embodiment provided by the present invention;

[0054] Figure 10 This is a front view of the clamping plate in the second embodiment provided by the present invention;

[0055] Figure 11 This is a side view of the clamping plate in the second embodiment provided by the present invention;

[0056] Figure 12 This is a schematic diagram of the structure of the acoustic logging tool provided by the present invention.

[0057] Explanation of reference numerals in the attached figures

[0058] 1-Mandrel; 2-Receiver transducer assembly; 3-Instrument housing;

[0059] 4- Acoustic logging azimuth receiver assembly; 5- Transmitting transducer; 6- Sound insulation body;

[0060] 11- Horizontal sound insulation groove; 12- Wiring hole; 13- Mounting hole;

[0061] 21-Base; 22-Receiving transducer; 23-Mounting mechanism;

[0062] 24-Locking mechanism; 25-Mounting screw; 31-Soundproof window;

[0063] 100 - Acoustic section; 200 - Circuit section; 201 - Through hole;

[0064] 211-Positioning hole; 212-Transducer clearance groove; 213-Mounting sleeve clearance groove;

[0065] 214 - Limiting step surface; 215 - Positioning elevation; 231 - Mounting sleeve;

[0066] 232 - Two clamping plates; 232 - Clamping plate; 241 - Locking nut;

[0067] 242 - Anti-loosening screw; 2141 - Limiting groove; 2321 - Limiting mounting groove;

[0068] 2322 - Mounting groove; 2323 - Limiting protrusion. Detailed Implementation

[0069] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0070] In the embodiments of the present invention, unless otherwise stated, directional terms such as "up," "down," "left," and "right" generally refer to the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use.

[0071] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0072] The terms "parallel" and "perpendicular" do not mean that the components must be absolutely parallel or perpendicular, but rather that they can be slightly tilted. For example, "parallel" simply means that its direction is more parallel than "perpendicular," not that the structure must be completely parallel, but that it can be slightly tilted.

[0073] The terms "horizontal," "vertical," and "sag" do not imply that a component must be absolutely horizontal, vertical, or sagging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0074] Furthermore, terms like "roughly" and "basically" are used to indicate that the content does not require absolute precision, but rather allows for a certain degree of deviation. For example, "roughly equal" does not simply mean absolute equality; in actual production and operation, achieving absolute "equality" is difficult, and a certain degree of deviation is generally present. Therefore, besides absolute equality, "roughly equal to" also includes the aforementioned situation where a certain degree of deviation exists. Using this as an example, in other cases, unless otherwise specified, terms like "roughly" and "basically" have similar meanings.

[0075] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0076] Figure 1 This is a schematic diagram of the acoustic logging azimuth receiver assembly provided by the present invention; Figure 2 This is a schematic diagram of the mandrel provided by the present invention; Figure 3 This is a schematic diagram of the receiving transducer assembly provided by the present invention; Figure 4 This is a cross-sectional schematic diagram of the receiving transducer assembly provided by the present invention; Figure 5 This is a side view of the base provided by the present invention; Figure 6 This is a cross-sectional schematic diagram of the base in the first embodiment provided by the present invention; Figure 7 This is a partially enlarged schematic diagram of the base in the second embodiment provided by the present invention; Figure 8 This is a front view of the clamping plate in the first embodiment provided by the present invention; Figure 9 This is a side view of the clamping plate in the first embodiment provided by the present invention; Figure 10 This is a front view of the clamping plate in the second embodiment provided by the present invention; Figure 11 This is a side view of the clamping plate in the second embodiment provided by the present invention; Figure 12 This is a schematic diagram of the structure of the acoustic logging tool provided by the present invention.

[0077] like Figure 1-3 As shown, this embodiment provides an acoustic logging azimuth receiving assembly, which includes:

[0078] The mandrel 1 has multiple transverse sound insulation grooves 11 spaced apart along its length.

[0079] Multiple receiving transducer assemblies 2 are spaced apart on the mandrel 1 along its length direction, and each receiving transducer assembly 2 includes:

[0080] The base 21 is sleeved on the mandrel 1;

[0081] At least one receiving transducer 22 is mounted on the base 21 via a mounting mechanism 23;

[0082] A locking mechanism 24 is provided on the base 21 for fixing the mounting mechanism 23 to the base 21.

[0083] Specifically, in this embodiment, multiple transverse sound-insulating grooves 11 are spaced apart along the length of the mandrel 1 to attenuate and delay the direct wave propagating from the acoustic logging tool body to the receiving transducer 22 on the acoustic logging azimuth receiving assembly 4, thereby reducing the interference of the direct wave signal on the effective signal. Preferably, the transverse sound-insulating grooves 11 are formed between two adjacent receiving transducer assemblies 2, and no openings are made at the locations where the receiving transducer assemblies 2 are installed. The number and spacing of the receiving transducer assemblies 2 can be determined according to actual usage requirements.

[0084] In addition, the receiving transducer mounted on the mandrel can be an azimuth receiving transducer assembly. When multiple azimuth receiving transducers are configured, their relative mounting angles on the mandrel are consistent. The receiving transducer adopts a cylindrical shape, including piezoelectric ceramics and electrode plates, which are bonded together into a cylindrical tube using a polymer adhesive. There are two electrode plates in total, with an outer diameter of 18mm, an inner diameter of 12mm, a tube wall thickness of 3mm, and a height of 50mm. The electrode plates are applied with silver paste. Preferably, eight cylindrical piezoelectric receiving transducers are used, evenly distributed around the base to ensure comprehensive and accurate data acquisition. The multiple cylindrical receiving transducers have identical parameters, materials, and performance. The size and number of transducers can be determined based on simulation and actual experimental results to ensure that the receiving sensitivity and azimuth resolution of the azimuth receiving transducer assembly meet the requirements. The receiving transducer can be a receiving transducer with azimuth resolution capability, or it can be another receiving transducer without azimuth resolution capability, or an azimuth receiving transducer using other design schemes.

[0085] Furthermore, such as Figure 2-3 As shown, the spindle 1 is hollow inside, and multiple wiring holes 12 and multiple mounting holes 13 are spaced apart along the length of the spindle 1. The wiring holes 12 are used to introduce the wires of the corresponding receiving transducer assembly 2 into the spindle 1; each mounting hole 13 is fitted with a corresponding mounting screw 25.

[0086] Each base 21 is provided with a positioning hole 211. The base 21 is fixedly sleeved on the spindle 1 through the corresponding positioning hole 211, the mounting hole 13 and the mounting screw 25.

[0087] Specifically, in this embodiment, to facilitate cable arrangement, the spindle 1 is configured with an internally hollow structure, and multiple wiring holes 12 are spaced apart along the length of the spindle 1. The wires of the corresponding receiving transducer assembly 2 are introduced into the spindle 1 through the wiring holes 12 to achieve data transmission. In addition, to facilitate the installation and removal of the receiving transducer assembly 2, multiple mounting holes 13 are spaced apart along the length of the spindle 1. At the same time, each base 21 is provided with a positioning hole 211. By passing mounting screws 25 through the positioning holes 211 and mounting holes 13 and tightening them, the base 21 is fixed to the spindle 1, thereby fixing the receiving transducer assembly 2.

[0088] Furthermore, such as Figure 3-4 As shown, the mounting mechanism 23 includes:

[0089] At least two mounting sleeves 231 are provided, with one mounting sleeve 231 provided at each of the two ends of each receiving transducer 22;

[0090] Two symmetrically arranged clamping plates 232 are provided, each with a limiting mounting groove 2321 extending through its middle. The two clamping plates 232 pass through the ends of the base 21 via the corresponding limiting mounting grooves 2321, thereby being mounted on the base 21. At least one mounting groove 2322 is provided on the opposite surfaces of the two clamping plates 232. The mounting groove 2322 is used to accommodate the corresponding mounting sleeve 231 to fix the receiving transducer 22 between the two clamping plates 232.

[0091] Specifically, a mounting sleeve 231 is provided at each of the two ends of each receiving transducer 22 to protect the receiving transducer 22 and prevent damage caused by compression during installation, thus affecting the measurement results. First, a limiting mounting groove 2321 is provided through the middle of each of the two clamping plates 232. The two clamping plates 232 pass through the ends of the base 21 via the corresponding limiting mounting grooves 2321, thereby fixing the clamping plates 232 onto the base 21. Simultaneously, to limit the movement of the receiving transducer 22, multiple mounting grooves 2322 are provided on the opposite surfaces of the two clamping plates 232. The ends of the mounting sleeves 231 are placed within the mounting grooves 2322, thereby fixing the receiving transducer 22. Preferably, the mounting sleeves 231 are made of non-metallic material, and the clamping plates 232 are made of metallic material. This fixing scheme ensures the stability of the installation and fixation, while also being simple in structure and effectively protecting the receiving transducer 22. The mounting sleeve 231 adopts a U-shaped structure, which can accommodate the end of the corresponding receiving transducer 22.

[0092] Furthermore, such as Figure 4 As shown, each mounting groove 2322 and each mounting sleeve 231 is provided with a through hole 201. The wires receiving the transducer 22 pass through the through holes of the corresponding mounting groove 2322 and the through holes 201 on the mounting sleeve 231 in sequence, and enter the spindle 1 through the wiring hole 12.

[0093] Specifically, in this embodiment, the through hole 201 is used to lead out the wires inside the transducer. In addition, it is also used to allow the oil to enter the receiving transducer 22 through the through hole 201 after the acoustic logging azimuth receiver assembly is assembled into a logging instrument and oil is introduced, so as to ensure the pressure balance inside and outside the transducer, protect the receiving transducer 22, and ensure its service life.

[0094] Furthermore, such as Figure 5 As shown, multiple transducer clearance grooves 212 are arranged radially at intervals along the base 21, and each transducer clearance groove 212 has a mounting sleeve clearance groove 213 at both ends.

[0095] The transducer clearance slot 212 is used to accommodate the receiving transducer 22;

[0096] The mounting sleeve relief groove 213 engages with the corresponding receiving mounting sleeve 231.

[0097] Specifically, in this embodiment, since the receiving transducer 22 is configured as a cylindrical structure, in order to reduce the overall volume of the receiving transducer assembly 2, a plurality of transducer clearance grooves 212 are provided radially at intervals along the base 21. The transducer clearance grooves 212 are arc-shaped grooves to accommodate the sidewalls of the receiving transducer. At the same time, a mounting sleeve clearance groove 213 is provided at both ends of each transducer clearance groove 212 and engages with the mounting sleeve 231 to realize the positioning and installation of the receiving transducer 22 and ensure installation accuracy.

[0098] Optionally, when a receiver transducer assembly has only one conventional cylindrical receiver transducer, the mandrel passes through the inside of the receiver transducer. The transducer is still secured to the mandrel by mounting sleeves and clamps at both ends that conform to the shape and size of the transducer.

[0099] Furthermore, such as Figure 6-7 As shown, the outer surface of the base 21 is provided with two limiting step surfaces 214 at intervals, and the clamping plate 232 is located on the corresponding limiting step surface 214.

[0100] Specifically, in this embodiment, in order to limit the clamping plate 232 and avoid excessive clamping force between the two clamping plates 232, which could damage the receiving transducer 22, two limiting step surfaces 214 are provided at intervals on the outer surface of the base 21, and the clamping plate 232 is located on the corresponding limiting step surface 214, serving as a bearing platform. This not only ensures that the clamping plate 232 is stably fixed on the base 21, but also supports and protects the receiving transducer 22.

[0101] Furthermore, such as Figure 6 , 8 As shown in Figure 9, at least one limiting groove 2141 is provided on the limiting step surface 214;

[0102] The clamping plate 232 is provided with at least one limiting protrusion 2323 that matches the limiting groove 2141. The limiting groove 2141 and the limiting protrusion 2323 match each other. When the clamping plate 232 is installed on the base 21, the engagement of the limiting groove 2141 and the corresponding limiting protrusion 2323 can prevent the clamping plate 232 from rotating relative to the base 21.

[0103] Specifically, in this embodiment, at least one limiting groove 2141 is provided on the limiting step surface 214, and at least one limiting protrusion 2323 matching the limiting groove 2141 is provided on the clamping plate 232. The limiting groove 2141 and the limiting protrusion 2323 match each other. During installation, the limiting protrusion 2323 is positioned within the limiting groove 2141, which prevents the clamping plate 232 from rotating during installation, thus preventing deviation in the installation angle of the receiving transducer 22. It also ensures that the two clamping plates 232 are installed on the base 21 at the same angle, making the acquisition angle between each receiving transducer assembly 2 the same, thereby ensuring the accuracy of data acquisition. The number of limiting protrusions 2323 and limiting grooves 2141 on the limiting step surface 214 is the same, and can be set accordingly according to actual usage requirements. This embodiment is applicable when the limiting mounting groove 2321 on the clamping plate 232 has a circular structure.

[0104] Furthermore, such as Figure 7 , 10 As shown in -11, the outer surface of the base 21 is provided with two positioning surfaces 215 at intervals. The positioning surfaces 215 match the limiting installation grooves 2321. When the clamping plate 232 is installed on the base 21, the positioning surfaces 215 engage with the corresponding limiting installation grooves 2321, which can prevent the clamping plate 232 from rotating relative to the base 21.

[0105] The limiting installation groove 2321 is a non-circular groove.

[0106] Specifically, in this embodiment, two positioning surfaces 215 are spaced apart on the outer surface of the base 21. The outer periphery of the positioning surfaces 215 is a non-circular surface. Similarly, the limiting mounting grooves 2321 are also set as matching non-circular grooves. This ensures that during installation, the positioning surfaces 215 and the corresponding limiting mounting grooves 2321 engage with each other, preventing the clamping plates 232 from rotating during installation and causing deviations in the installation angle of the receiving transducer 22. It also ensures that the two clamping plates are installed on the base 21 at the same angle, making the acquisition angles of each receiving transducer assembly 2 the same, thus guaranteeing the consistency of received signals at different source distances. The number of limiting protrusions 2323 and limiting grooves 2141 on the limiting step surface 214 are the same, and can be configured according to actual usage requirements. Preferably, both the positioning surfaces 215 and the corresponding limiting mounting grooves 2321 can be configured as oblong hole structures.

[0107] Furthermore, such as Figure 4 As shown, the outer surface of the base 21 is provided with external threads at intervals;

[0108] The locking mechanism 24 includes:

[0109] Two locking nuts 241 are used to fix the corresponding mounting mechanism 23 to the base 21 by means of threaded connection.

[0110] Specifically, in this embodiment, the corresponding mounting mechanism 23 is fixed to the base 21 by means of a locking nut 241 through a threaded connection, which can ensure a stable connection and facilitate installation and disassembly.

[0111] Furthermore, such as Figure 4 As shown, each locking nut 241 is provided with at least one screw hole;

[0112] The locking mechanism 24 further includes:

[0113] At least two locking screws 242 are provided, with one locking screw 242 installed in each screw hole, to prevent the locking nut 241 from loosening by tightening the locking screws 242 after the locking nut 241 has been tightened.

[0114] Specifically, in this embodiment, since the equipment vibrates during the logging process, in order to ensure the stability of the connection structure and prevent the locking nut 241 from loosening, in addition to fixing the mounting mechanism 23 to the base 21 by means of threaded connection using the locking nut 241, at least one threaded hole is provided on the locking nut 241, and after the locking nut 241 is tightened, the anti-loosening screw 242 is tightened to prevent the locking nut 241 from loosening.

[0115] Compared with rectangular transducers that vibrate with thickness, the above-described scheme significantly improves the receiving sensitivity, reaching the receiving sensitivity of conventional large-diameter, non-azimuth-resolution monopole piezoelectric transducers. Furthermore, this scheme achieves high receiving sensitivity and a wide receiving bandwidth while possessing multi-azimuth receiving capabilities, making it applicable to the acoustic system design of 3D acoustic logging instruments. It also allows for compatibility between azimuth receiving transducer components and conventional receiving transducers on the same acoustic logging instrument. Moreover, it can be applied to instruments of different sizes, offering universal value for the acoustic system design of acoustic logging instruments across different logging series.

[0116] This embodiment also provides an acoustic logging tool, such as... Figure 12 As shown, the acoustic logging tool includes:

[0117] An acoustic section 100 and at least one circuit section 200, the circuit section 200 being disposed at an end of the acoustic section 100;

[0118] The acoustic subsection 100 includes:

[0119] The instrument housing 3 has internal storage space;

[0120] The aforementioned acoustic logging azimuth receiver assembly 4 is housed within the internal accommodating space of the instrument housing 3;

[0121] The transmitting transducer 5 is disposed in the internal accommodating space of the instrument housing 3;

[0122] Multiple sound-insulating elements 6 are provided on the instrument housing and spindle between the transmitting transducer 5 and the acoustic logging azimuth receiving assembly 4, as well as between two adjacent receiving transducer assemblies 2 of the acoustic logging azimuth receiving assembly 4. The sound-insulating elements 6 are used to attenuate and delay the sound waves propagating on the housing and spindle. The design of the sound-insulating elements 6 includes, but is not limited to, transverse sound-insulating grooves 11.

[0123] Furthermore, an acoustic window 31 is provided on the instrument housing 3 at a position opposite to the transmitting transducer 5 and the receiving transducer 22, for allowing acoustic waves to penetrate the instrument housing 3. The internal space of the instrument housing 3 is filled with oil to balance the well pressure during the logging process, and both the transmitting transducer 5 and the acoustic logging azimuth receiving assembly 4 are sealed in the oil.

[0124] Specifically, in this embodiment, the circuit section 200 is connected to the transmitting transducer 5 and the receiving transducer 22 in the acoustic system section 100. The circuit section 200 contains functional modules such as a power supply module, a transmitting module, a data acquisition module, and a communication module. The power supply circuit supplies power to the entire circuit system. The transmitting module controls the transmitting transducer 5 to transmit. The data acquisition module collects the waveforms received by the receiving transducer 22. The communication module transmits useful signals to the ground. When one circuit section 200 is provided, it is placed at any end of the acoustic system section 100; when two circuit sections 200 are provided, one is placed at each end of the acoustic system section 100. The sound-permeable window has sound transmission properties, allowing the energy emitted by the transmitting transducer 5 to diffuse into the wellbore. After the energy propagates through the wellbore and the formation, the sound waves carrying information about the wellbore and the formation propagate through the sound-permeable window to the receiving transducer 22, where they are received.

[0125] Specifically, in this embodiment, during sonic logging, the sonic logging tool is located inside the wellbore, which is filled with mud. The wellbore is surrounded by formation or a radially layered structure consisting of casing, cement sheath, and formation. The sonic logging tool includes a transmitting transducer 5 and multiple receiving transducers 22, which are mounted on the sonic logging azimuth receiving assembly 4. A portion of the energy emitted by the transmitting transducer 5 is transmitted through the mud to the formation and then back into the wellbore, where it is received by the receiving transducers 22 on the sonic logging azimuth receiving assembly 4. This portion of the signal carries formation information and is used to analyze formation characteristics. Another portion of the energy emitted by the transmitting transducer 5 propagates through the sonic logging tool body and is received by the receiving transducers 22 on the sonic logging azimuth receiving assembly 4. This portion of the energy is the direct wave. Since the direct wave interferes with the extraction of effective formation information, a sound insulation element 6 is installed on the sonic logging tool to attenuate and delay the direct wave, thereby ensuring the accuracy of data acquisition. The acoustic logging tool is equipped with an instrument housing 3 to ensure its mechanical strength and protect its internal structure. Inside the instrument housing 3 is a sealing structure (e.g., rubber) filled with silicone oil to balance the pressure within the well. In some cases, the instrument housing 3 can also serve as the sealing structure directly. This sealing structure provides both sealing and acoustic transmission. The transmitting transducer 5 and the acoustic logging azimuth receiver assembly 4 are located inside the sealed structure and are immersed in silicone oil. When the receiving transducer on the acoustic logging azimuth receiver assembly 4 is an azimuth receiver transducer, the acoustic logging tool can distinguish the acoustic properties of the formation around the well at different circumferential azimuths. When this azimuth receiver transducer has high receiving sensitivity, the acoustic logging tool can more clearly distinguish changes in the formation around the well, thus providing more comprehensive and higher-quality information for geophysical exploration.

[0126] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0127] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details described above. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe the various possible combinations.

[0128] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the embodiments of the present invention, they should also be regarded as the content disclosed by the embodiments of the present invention.

Claims

1. A sonic logging azimuth receiver assembly, characterized in that, The acoustic logging azimuth receiver assembly includes: The mandrel (1) has multiple transverse sound insulation grooves (11) spaced apart along its length. Multiple receiving transducer assemblies (2) are spaced apart on the mandrel (1) along its length direction, and each receiving transducer assembly (2) includes: The base (21) is sleeved on the mandrel (1); At least one receiving transducer (22) is mounted on the base (21) via a mounting mechanism (23); A locking mechanism (24) is provided on the base (21) for fixing the mounting mechanism (23) on the base (21).

2. The acoustic logging azimuth receiver assembly according to claim 1, characterized in that, The spindle (1) is hollow inside, and a plurality of wiring holes (12) and a plurality of mounting holes (13) are spaced apart along the length of the spindle (1). The wiring holes (12) are used to introduce the wires of the corresponding receiving transducer assembly (2) into the spindle (1). Each mounting hole (13) is fitted with a corresponding mounting screw (25). Each base (21) is provided with a positioning hole (211), and the base (21) is fixedly sleeved on the mandrel (1) through the corresponding positioning hole (211) and the matching mounting hole (13) and mounting screw (25).

3. The acoustic logging azimuth receiving assembly according to claim 1, characterized in that, The installation mechanism (23) includes: At least two mounting sleeves (231) are provided at each of the two ends of each receiving transducer (22); Two symmetrical clamping plates (232) are provided, and a limiting installation groove (2321) is provided through the middle of each clamping plate (232). The two clamping plates (232) pass through the end of the base (21) through the corresponding limiting installation groove (2321) and are thus set on the base (21). At least one mounting groove (2322) is provided on the opposite surface of each clamping plate (232). The mounting groove (2322) is used to accommodate the corresponding mounting sleeve (231) to fix the receiving transducer (22) between the two clamping plates (232).

4. The acoustic logging azimuth receiver assembly according to claim 3, characterized in that, Each mounting groove (2322) and each mounting sleeve (231) is provided with a through hole (201). The wire receiving the transducer (22) passes through the through hole of the corresponding mounting groove (2322) and the through hole (201) of the mounting sleeve (231) in sequence, and enters the spindle (1) through the wiring hole (12).

5. The acoustic logging azimuth receiver assembly according to claim 3, characterized in that, Multiple transducer clearance slots (212) are provided at radial intervals along the base (21), and each transducer clearance slot (212) has a mounting sleeve clearance slot (213) at both ends. The transducer clearance slot (212) is used to accommodate the receiving transducer (22); The mounting sleeve relief groove (213) engages with the corresponding receiving mounting sleeve (231).

6. The acoustic logging azimuth receiver assembly according to claim 3, characterized in that, The outer surface of the base (21) is provided with two limiting step surfaces (214) spaced apart, and the clamping plate (232) is located on the corresponding limiting step surface (214).

7. The acoustic logging azimuth receiver assembly according to claim 6, characterized in that, At least one limiting groove (2141) is provided on the limiting step surface (214); The clamping plate (232) is provided with at least one limiting protrusion (2323) that matches the limiting groove (2141). The limiting groove (2141) and the limiting protrusion (2323) match each other. When the clamping plate (232) is installed on the base (21), the engagement of the limiting groove (2141) and the corresponding limiting protrusion (2323) can prevent the clamping plate (232) from rotating relative to the base (21).

8. The acoustic logging azimuth receiver assembly according to claim 6, characterized in that, The outer surface of the base (21) is provided with two positioning surfaces (215) spaced apart. The positioning surfaces (215) match the limiting mounting grooves (2321). When the clamping plate (232) is installed on the base (21), the positioning surfaces (215) engage with the corresponding limiting mounting grooves (2321), which can prevent the clamping plate (232) from rotating relative to the base (21). The limiting installation groove (2321) is a non-circular groove.

9. The acoustic logging azimuth receiver assembly according to claim 1, characterized in that, The outer surface of the base (21) is provided with external threads at intervals; The locking mechanism (24) includes: Two locking nuts (241) are used to fix the corresponding mounting mechanism (23) to the base (21) by means of threaded connection.

10. The acoustic logging azimuth receiver assembly according to claim 9, characterized in that, Each locking nut (241) is provided with at least one screw hole; The locking mechanism (24) further includes: At least two locking screws (242) are provided, one locking screw (242) is installed in each screw hole, and the locking nut (241) is prevented from loosening by tightening the locking screws (242) after the locking nut (241) has been tightened.

11. A sonic logging tool, characterized in that, The acoustic logging tool includes: An acoustic section (100) and at least one circuit section (200), the circuit section (200) being disposed at an end of the acoustic section (100); The acoustic subsection (100) includes: The instrument housing (3) has an internal storage space; The acoustic logging azimuth receiving assembly (4) according to any one of claims 1-10 is disposed in the internal accommodating space of the instrument housing (3); The transmitting transducer (5) is disposed in the internal accommodating space of the instrument housing (3); Multiple sound insulation bodies (6) are provided on the instrument housing (3) and spindle (1) between the transmitting transducer (5) and the acoustic logging azimuth receiving assembly (4) and between two adjacent receiving transducer assemblies (2) of the acoustic logging azimuth receiving assembly (4). The sound insulation bodies (6) are used to attenuate and delay the sound waves propagating on the housing and spindle.

12. The acoustic logging tool according to claim 11, characterized in that, The instrument housing (3) is provided with a sound-transmitting window (31) at a position opposite to the transmitting transducer (5) and the receiving transducer (22) for allowing sound waves to penetrate the instrument housing (3).

13. The acoustic logging tool according to claim 11, characterized in that, The internal space of the instrument housing (3) is filled with oil to balance the well pressure during the logging process. The transmitting transducer (5) and the acoustic logging azimuth receiver assembly (4) are both sealed in the oil.

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